تفاعل #218956

معادلة التفاعل

pent-4-enoic acid

isobutyl chloroformate

triethylamine

triethylamine

2-(3-diisopropylamino-1-phenyl-propyl)-4-hydroxymethylphenol

→

(±)-pent-4-enoic acid 2-(3-diisopropylamino-1-phenylpropyl)-4-(pent-4-enoyloxymethyl)-phenyl ester

المردود 50.0%

المذيبات

dichloromethane

dichloromethane

ظروف التفاعل

المعالجة

1. 1
   درجة الحرارةA cooled
2. 2
   أخرىThe cooling bath was then removed
3. 3
   غسيلwashed several times with water and finally aqueous 5% sodium hydrogen carbonate solution
4. 4
   أخرىAfter drying
5. 5
   ترشيح(sodium sulphate), filtration and evaporation the oily residue
6. 6
   workup.DISSOLUTIONwas re-dissolved in a small volume of a solvent mixture
7. 7
   غسيلElution of the column
8. 8
   أخرىwith the same solvent mixture, collection of the appropriate fractions, and evaporation of the combined fractions

الإجراء التجريبي

A cooled (4° C.) mixture of pent-4-enoic acid, isobutyl chloroformate, and triethylamine (each 5.84 mmol) in 10 ml of dichloromethane was stirred 5 hrs under an atmosphere of dry nitrogen gas. The cooling bath was then removed and both triethylamine (1.46 mmol) and 2-(3-diisopropylamino-1-phenyl-propyl)-4-hydroxymethylphenol (1.46 mmol) were added in one portion. After 18 hrs the mixture was diluted with dichloromethane (30 ml), washed several times with water and finally aqueous 5% sodium hydrogen carbonate solution. After drying (sodium sulphate), filtration and evaporation the oily residue was re-dissolved in a small volume of a solvent mixture consisting of ethyl acetate/heptane/triethylamine (65/30/5, vol.-%) and applied on a silica gel flash chromatography column. Elution of the column with the same solvent mixture, collection of the appropriate fractions, and evaporation of the combined fractions gave (±)-pent-4-enoic acid 2-(3-diisopropylamino-1-phenylpropyl)-4-(pent-4-enoyloxymethyl)-phenyl ester as a pale yellow syrupy oil (50% yield), tlc: (4) 0.75. NMR (CDCl3): 18.95, 20.77, 27.75, 28.87, 33.58, 36.83, 42.13, 43.72, 48.71, 65.85, 70.55, 115.47, 115.99, 122.45, 126.26, 127.08, 127.96, 128.11, 28.83, 133.73, 136.38, 136.79, 137.04, 143.77, 148.46, 171.11, 172.78.

المصدر